happen有进行时态但是不可用于被动语态。
例如:It
is
happening
as
we
speak.(现在进行时)
happen
英[ˈhæpən]
美[ˈhæpən]
vi.
发生;
出现;
碰巧;
偶然遇到;
[例句]
1、We
cannot
say
for
sure
what
will
happen.
我们无法确定会发生什么事。
2、She
wondered
what
would
happen
if
her
parents
found
her.
她不知道如果父母找到自己会有什么结果。
3、If
we
had
been
spotted
at
that
point,
I
don't
know
what
would
have
happened
to
us.
如果当时我们被发现了,我不知道会有什么后果。
4、We
happened
to
discover
we
had
a
friend
in
common.
我们凑巧发现我们有一个共同的朋友。
5、She
called
Amy
to
see
if
she
had
any
idea
of
her
son's
whereabouts.
As
it
happened,
Amy
had.
她打电话给埃米,看她是否知道自己儿子的行踪。埃米还真就知道。
对了一半
happen
不可用于被动语态,但可用于进行时态。
请看例句:
it‘s
happened
to
me
before.
(是分词,
不是被动语态)
it
is
happening
as
we
speak.
(现在进行时)
希望帮到了你
满意敬请采纳,谢谢。